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Generic model of MMC-VSC-HVDC for Interaction Study With AC Power System

IEEE TRANSACTIONS ON POWER SYSTEMS 2016年第1期31卷 27-34页

作者： Ngoc-Tuan Trinh Zeller, Marcus Wuerflinger, Klaus Erlich, Istvan Univ Duisburg Essen Inst Elect Power Syst D-47057 Duisburg Germany Siemens AG Energy Sect Power Transmiss Solut D-91058 Erlangen Germany

This paper presents a generic rms model of voltage source converter (VSC) in modular multilevel converter (MMC) topology for high-voltage direct current (HVDC) application. The generic rms model is suitable for stability analysis of a MMC-VSC-HVDC interconnected to ac power system. Based on the rms model, a linearized model for analytical model analysis is also developed and described. The parameters of the generic rms model are identified via an established averaged EMT model. The dynamic performance of the proposed generic model is tested in both time and frequency domain analysis using a typical high-voltage transmission system.

关键词： Generic rms model HVDC linearized model modular multilevel converter (MMC) small-signal stability analysis transient stability analysis voltage source converter (VSC)

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Feedback System Design for Plasma Horizontal Position Control in IR-T1 Tokamak

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JOURNAL OF FUSION ENERGY 2016年第2期35卷 415-421页

作者： Naghidokht, A. Khodabakhsh, R. Ghoranneviss, M. Elahi, A. Salar Urmia Univ Dept Phys Orumiyeh Iran Islamic Azad Univ Sci & Res Branch Plasma Phys Res Ctr Tehran Iran

Determination of accurate plasma horizontal position during plasma discharge and a control system based on feedback is essential to transport it to a safe position near the set point. The design of feedback controller is usually based on primitive modeling of the plasma itself. By using the plasma-circuits linearized model, proportional integral derivative based controllers and a model for the power supply of vertical coil system with some values for its poles, we analyzed step feedback response of the overall system of IR-T1 tokamak and corresponding Bode diagrams for two cases with and without the plasma resistance and the eddy currents distribution. Although experimental validation of the plasma model and also the overall system behavior is an important exercise, the results predicted in simulation can give us good insight about system.

关键词： Tokamak feedback control Plasma-circuits linearized model PID controller

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modeling of LCC HVDC System Based on Mass-Damping-Spring Concept

Modeling of LCC HVDC System Based on Mass-Damping-Spring Con...

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IEEE-Power-and-Energy-Society General Meeting (PESGM)

作者： Zhang, Meiqing Yuan, Xiaoming Huazhong Univ Sci & Technol State Key Lab Adv Electromagnet Engn & Technol Wuhan Peoples R China

ISBN: (纸本)9781509041688

This paper presents a linearized model of a linecommutated converter-based HVDC system based on massdamping-spring concept. The model takes the characteristics of converters, controllers and DC transmission line into consideration and represents the dynamic behavior of LCC HVDC system in the low frequency range. The developed model not only can be easily used for stability analysis with some linear analysis tools, such as classical modal analysis or frequency domain analysis tools, but also can be used to help researchers to intuitively understand and interpret the analysis or simulation results obtained from these classical analysis tools. What's more, it is convenient for the model to adopt mass-damping-spring concept to qualitatively and quantitatively measure LCC HVDC system, which makes it suitable for large system-level stability analysis studies. The model is validated by the CIGRE HVDC benchmark time-domain model in PSCAD/EMTDC.

关键词： Large system-level stability analysis line-commutated converter high voltage dc transmission linearized model mass-damping-spring concept physical mechanism explanation

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LQR Controller for Car-like Robot 35

LQR Controller for Car-like Robot

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第35届中国控制会议

作者： LIN Fengda LIN Zijian QIU Xiaohong School of Automation Science and Engineering South China University of Technology Institute of computer application engineering South China University of Technology

ISBN: (纸本)9781509009107

This work studies the trajectory tracking for a car-like robot. Based on the kinematic equations of the mobile robot, an tracking error model is obtained. And then, this nonlinear model is linearized around origin. Based on local linearized model, an optimal controller is designed for the trajectory tracking problem by using optimal linear quadratic(LQ) design approach. The simulation shows the effectiveness of optimal LQR(linear quadratic regulator) controller for the cases where the robot tracks both straight and curve trajectories.

关键词： LQR Tracking Control linearized model Four-wheel Car

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Dynamic performance of a vector-current controlled unified power flow controller installed in a real Chinese power network

Dynamic performance of a vector-current controlled unified p...

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12th IET International Conference on AC and DC Power Transmission (ACDC 2016)

作者： B X Ren H F Li W J Du Z Chen H F Wang S Q Bu North China Electric Power University Beijing Beijing CN State Grid Jiangsu Electric Power Company Nanjing 210024 China Southeast University Nanjing Jiangsu CN Brunel University Uxbridge Middlesex GB

ISBN: (纸本)9781510832657

This paper examines the dynamic performance of a vector-current controlled unified power flow controller (UPFC) to be installed in an actual Chinese power network. This first UPFC of China, with a total rating of ±120MVA, has been in full operation since the end of 2015. This paper establishes the non-linear dynamic mathematical model of the vector-current controlled UPFC to be installed in the power network and carries out detailed examination on the dynamic performance of the UPFC and its impact on power system small-signal angular stability. The linearized model of the UPFC is derived afterwards. Based on the derived model, dynamic interactions among the multiple control functions of the UPFC are investigated by using the method of relative gain array (RGA). It is found that the vector-current controlled UPFC exhibits well decoupling performance among multiple control loops. This finding is further confirmed by the results of non-linear simulation. Moreover, modal analysis is conducted to examine the impact of the installation of the UPFC on the damping of electromechanical oscillation modes of the real power network. Conclusions of the modal analysis are further validated by the non-linear simulation results.

关键词： small-signal angular stability vector-current controlled UPFC non-linear dynamic mathematical model linearized model RGA

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modeling of LCC HVDC System Based on Mass-Damping-Spring Concept

Modeling of LCC HVDC System Based on Mass-Damping-Spring Con...

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IEEE Power and Energy Society General Meeting

作者： Meiqing Zhang Xiaoming Yuan State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong Univ. of Sci. and Tech.

ISBN: (纸本)9781509041695

This paper presents a linearized model of a line-commutated converter-based HVDC system based on mass-damping-spring concept. The model takes the characteristics of converters, controllers and DC transmission line into consideration and represents the dynamic behavior of LCC HVDC system in the low frequency range. The developed model not only can be easily used for stability analysis with some linear analysis tools, such as classical modal analysis or frequency domain analysis tools, but also can be used to help researchers to intuitively understand and interpret the analysis or simulation results obtained from these classical analysis tools. What's more, it is convenient for the model to adopt mass-damping-spring concept to qualitatively and quantitatively measure LCC HVDC system, which makes it suitable for large system-level stability analysis studies. The model is validated by the CIGRE HVDC benchmark time-domain model in PSCAD/EMTDC.

关键词： Large system-level stability analysis Line-commutated converter high voltage dc transmission linearized model Mass-damping-spring concept Physical mechanism explanation HVDC SYSTEMS Stability analysis modal analysis modeling

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Singularly Perturbed Feedback Linearization for SISO Nonlinear Systems with measurement of the state

Singularly Perturbed Feedback Linearization for SISO Nonline...

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European Control Conference (ECC)

作者： Puga, S. Bonilla, M. Moog, C. H. Malabre, M. Lozano, R. CNRS CINVESTAV IPN CONTROL AUTOMATUMI 3175 Mexico City 07000 DF Mexico IPN ESFM Dept Ingn Matemat Av IPN Unidad Prof ZacatoncoEdif 9 Mexico City 07738 DF Mexico LUNAM Univ CNRS UMR 6597 IRCCyN F-44321 Nantes 03 France CNRS CINVESTAV UMI 3175 Houdiasyc UTC Mexico City 07000 DF Mexico

ISBN: (纸本)9783952426937

In this paper, a feedback linearization technique is proposed. Input-output feedback linearization is applied to the nonlinear model to make it linear. The controller of the linearized model is designed by linear control theory. We consider that the state is measured. The tracking control law is based on pole placement and regular perturbations techniques. The proposed control scheme is illustrated on a numerical example and gives satisfactory results.

关键词： control system synthesis feedback linear systems linearisation techniques nonlinear control systems pole assignment singularly perturbed systems SISO nonlinear systems controller design input-output feedback linearization linear control theory linearized model nonlinear model pole placement regular perturbations techniques singularly perturbed feedback linearization state measurement tracking control law Linear systems Load modeling Nonlinear systems Service robots Stability analysis Vehicle dynamics

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Computational model for the analysis of distributed generation in systems including smart grids

Computational model for the analysis of distributed generati...

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IEEE PES Innovative Smart Grid Technologies Latin America (ISGT LATAM) Conference

作者： Sepulveda, Camilo Resener, Mariana Haffner, Sergio Pereira, Luis A. Univ Fed Rio Grande do Sul PPGEE Porto Alegre RS Brazil

ISBN: (纸本)9781467366052

this work presents a simplified computational model for the analysis and the optimization of distribution networks considering the presence of smart grids. The determination of bus voltages and branch currents is based on a linear approximation, which allows to evaluate the impact on the network resulting from the connection of different distributed generation sources (DG). One of the main advantages of the proposed model is the convergence for any operation condition. Furthermore, it is possible to apply the model to problems concerning the operation and expansion of smarts grids. Finally, to test and validate the model, it was applied to an existing distribution network composed of 135 buses and with distributed generation. The main results are presented and discussed.

关键词： distributed generation distribution system planning and modeling optimization linearized model smart grids

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modelo aproximado de sistemas de distribuição considerando geração distribuida e o efeito da tensão na carga

Modelo aproximado de sistemas de distribuição considerando...

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作者： Rangel, Camilo Alberto Sepúlveda

This work presents an approximate model developed to the analysis of electrical distribution systems at steady state. Both mathematical and theoretical details are given considering the representation of the shunt elements (loads and generators) and the operating limits of the network, using linear approximations. The linear modeling adopted resulted in a simple way to determine the values of the voltages and currents of the system; further the model can be applied to optimization problems related to optimal operation and expansion planning of distribution systems. The load representation considers the influence of voltage variations, which play an important role in the distribution networks. This work also considers the inclusion of distributed generation (DG), which is assessed under several modes of operation, including one mode which allows to minimize the losses at the node where the DG is located. To validate the proposed approach, the results for two example networks, given in terms of voltages, currents and losses, were compared with corresponding results obtained with conventional load flow model, solved by the backward-forward sweep method. The examples networks used to test and validate the model are known distribution systems, one having 70 and the other 135 nodes. Regarding the system with 70 nodes, the inclusion of DG was studied for several operational modes. Finally, the system of 135 nodes were used to compare the results of the proposed model with the results of the conventional load flow; in this case, the GD was characterized as a controlled-voltage bar (PV) for various levels of active power injection into the bar where the GD is located. The conclusions show the validity and advantages of the proposed model. ...

关键词： Energia elétrica : Distribuição Distribution system planning modelos matemáticos Optimization linearized model ZIP load model Distributed generation Current injection model Dissertação

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linearized models for a new magnetic control in MAST

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FUSION ENGINEERING AND DESIGN 2013年第6-8期88卷 1091-1096页

作者： Artaserse, G. Maviglia, F. Albanese, R. McArdle, G. J. Pangione, L. Assoc Euratom ENEA Fus I-00044 Frascati RM Italy Assoc Euratom ENEA CREATE I-80125 Naples Italy EURATOM CCFE Fus Assoc Culham Sci Ctr Abingdon OX14 3DB Oxon England

The aim of this work is to provide reliable linearized models for the design and assessment of a new magnetic control system for MAST (Mega Ampere Spherical Tokamak) using rtEFIT, which can easily be exported to MAST Upgrade. linearized models for magnetic control have been obtained using the 2D axisymmetric finite element code CREATE L MAST linearized models include equivalent 2D axisymmetric schematization of poloidal field (PF) coils, vacuum vessel, and other conducting structures. A plasmaless and a double null configuration have been chosen as benchmark cases for the comparison with experimental data and EFIT reconstructions. Good agreement has been found with the EFIT flux map and the experimental signals coming from magnetic probes with only few mismatches probably due to broken sensors. A suite of procedures (equipped with a user friendly interface to be run even remotely) to provide linearized models for magnetic control is now available on the MAST linux machines. A new current driven model has been used to obtain a state space model having the PF coil currents as inputs. Dynamic simulations of experimental data have been carried out using linearized models, including modelling of the effects of the passive structures, showing a fair agreement. The modelling activity has been useful also to reproduce accurately the interaction between plasma current and radial position control loops. (C) 2013 Euratom-ENEA Association sulla Fusione. Published by Elsevier B.V. All rights reserved.

关键词： MAST linearized model Tokamak Magnetic control Equilibrium State space model

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